A mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel

Abstract

A mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel comprises a mold body, a first reinforcing rib and a second reinforcing rib, wherein the mold body is provided with a molding cavity for molding a preform, the first reinforcing rib and the second reinforcing rib are distributed at a certain interval on the outer wall of the mold body, the first reinforcing rib surrounds the outer wall of the mold body, the second reinforcing rib spirally surrounds the outer wall of the mold body, the first reinforcing rib and the end of the mold body are distributed at a certain interval to form a first circulating water groove, the first reinforcing rib and the second reinforcing rib are distributed at a certain interval to form a second circulating water groove, through the annular flow mode of cooling liquid in the first circulating water groove and the second circulating water groove, the cross-section and flow rate between the water grooves in the cooling water channel are basically equivalent, thereby solving the difference in the flow rate of cooling liquid in the first water groove and subsequent other water grooves in the mold cavity, and improving the axial cooling uniformity of the cooling water channel and the circumferential cooling uniformity of the first groove.

Description

Technical Field

[0001] The invention relates to the technical field of mold cavity cooling water channel structures, and in particular to a mold cavity cooling water channel structure combining a circulating water channel with a spiral water channel. Background Art

[0002] At present, the cooling water channel structure of the mold cavity for fast multi-cavity PET (polyethylene terephthalate) preform molds is generally a spiral water channel. When assembled with the mold cavity clamping ring, in order to cool deeply to the transition section of the preform, the cross-sectional width of the first water channel of the mold cavity water channel is generally nearly twice or more than the cross-sectional width of other water channels, which will cause the flow rate of the cooling liquid in the first water channel to be reduced by half or more than that in other water channels, resulting in uneven cooling along the axial direction. At the same time, since the transition water channel of the spiral water channel is usually an inclined spiral groove, this will result in a thicker wall area in the first water channel, which is likely to cause uneven circumferential cooling of the outer surface temperature of the preform covered by the first water channel area. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a mold cavity cooling water channel structure combining a circulating water channel with a spiral water channel.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel comprises a mold body, a first reinforcing rib and a second reinforcing rib, wherein the mold body is provided with a molding cavity for molding a preform, the first reinforcing rib and the second reinforcing rib are distributed at a certain interval on the outer wall of the mold body, the first reinforcing rib surrounds the outer wall of the mold body, the second reinforcing rib spirally surrounds the outer wall of the mold body, the first reinforcing rib and the end of the mold body are distributed at a certain interval to form a first circulating water groove, the first reinforcing rib and the second reinforcing rib are distributed at a certain interval to form a second circulating water groove, the second reinforcing rib spirally surrounds the outer wall of the mold body to form a spiral water groove, and the first circulating water groove, the second circulating water groove and the spiral water groove are connected in sequence to form a continuous cooling water channel.

[0006] As a further improvement of the present invention, the first reinforcing rib is provided with a first water outlet for connecting the first circulating water trough with the second circulating water trough, the first reinforcing rib is provided with a first water inlet formed by bending toward one side of the second reinforcing rib, the head end of the second reinforcing rib is separated from the first reinforcing rib to form a second water inlet connecting the second circulating water trough with the spiral water trough, and the end of the second reinforcing rib is provided with a second water outlet of the spiral water trough.

[0007] As a further improvement of the present invention, the first reinforcement rib includes two first straight sections and a curved section connected between the two first straight sections, one end of the two first straight sections is connected to the curved section, and the other ends of the two first straight sections are spaced apart to form a first water outlet, the arc lengths of the two first straight sections are equal, and the two first straight sections are perpendicular to the center line of the mold body.

[0008] As a further improvement of the present invention, the second reinforcing rib is composed of second straight segments and first oblique segments continuously alternating, the second straight segments are perpendicular to the center line of the mold body, adjacent second straight segments and adjacent first oblique segments are distributed on the surface of the mold body with the same spacing, the second straight segment forms a certain angle with the first oblique segment, and connects two adjacent second straight segments, so that the entire second reinforcing rib forms a continuous structure.

[0009] As a further improvement of the present invention, the distance between the first straight segment and the end of the mold body, the distance between the first straight segment and the second straight segment, and the distance between adjacent second straight segments are all equal.

[0010] As a further improvement of the present invention, the protrusion height of the first straight section from the mold body surface is lower than the protrusion height of the curved section from the mold body surface, and the curved section is provided with a circumferential positioning feature protruding from the first straight section to form a mold cavity and a mold cavity locking ring when assembled.

[0011] As a further improvement of the present invention, rounded corners are used for transition between the first reinforcing rib and the cooling water channel, and between the second reinforcing rib and the cooling water channel.

[0012] As a further improvement of the present invention, the central water inlet point of the first water inlet and the central water outlet point of the first water outlet are distributed along the central axis of the mold body rotated 180 degrees.

[0013] As a further improvement of the present invention, the central water outlet point of the first water outlet and the central water inlet point of the second water inlet are distributed along the central axis of the mold body rotated 180 degrees.

[0014] As a further improvement of the present invention, the angle between the second straight section and the first oblique section is 45°.

[0015] The beneficial effects of the present invention are as follows: the present invention makes the cross-sections and flow rates between the water grooves in the cooling water channel basically equivalent through the annular flow mode of the cooling liquid in the first circulating water groove and the second circulating water groove, thereby solving the difference in the flow rate of the cooling liquid in the first water groove of the mold cavity and the subsequent other water grooves, and improving the axial cooling uniformity of the cooling water channel and the circumferential cooling uniformity of the first groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 Schematic diagram of the assembly structure of the mold cavity and the mold cavity locking ring of this embodiment;

[0018] Figure 2 Schematic diagram of the exploded structure of the mold cavity and the mold cavity locking ring of this embodiment;

[0019] Figure 3 It is the front view of the mold cavity of this embodiment;

[0020] Figure 4 It is a left view of the mold cavity of this embodiment;

[0021] Figure 5 It is a rear view of the mold cavity of this embodiment. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Example:

[0024] like Figures 1 to 5As shown, this embodiment discloses a mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel, comprising a mold body 3, a first reinforcing rib 4 and a second reinforcing rib 5, wherein the mold body 3 is provided with a molding cavity for molding a preform, the first reinforcing rib 4 and the second reinforcing rib 5 are distributed on the outer wall of the mold body 3 at a certain interval, the first reinforcing rib 4 surrounds the outer wall of the mold body 3, the second reinforcing rib 5 spirally surrounds the outer wall of the mold body 3, the first reinforcing rib 4 and the end of the mold body 3 are distributed at a certain interval to form a first circulating water groove 6, the first reinforcing rib 4 and the second reinforcing rib 5 are distributed at a certain interval to form a second circulating water groove 7, the second reinforcing rib 5 spirally surrounds the outer wall of the mold body 3 to form a spiral water groove 8, the first circulating water groove 6, the second circulating water groove 7 and the spiral water groove 8 are connected in sequence to form a continuous cooling water channel. The first reinforcing rib 4 is provided with a first water outlet 9 for connecting the first circulating water trough 6 with the second circulating water trough 7, the first reinforcing rib 4 is provided with a first water inlet 10 formed by bending toward one side of the second reinforcing rib 5, the head end of the second reinforcing rib 5 is separated from the first reinforcing rib 4 to form a second water inlet 11 for connecting the second circulating water trough 7 with the spiral water trough 8, and the end of the second reinforcing rib 5 is provided with a second water outlet 12 of the spiral water trough 8. The cooling liquid enters the first circulating water trough 6 from the first water inlet 10, flows along the two semicircular water troughs of the first circulating water trough 6 in two streams of cooling liquid, then converges at the first water outlet 9 and enters the second circulating water trough 7, flows along the two semicircular water troughs of the second circulating water trough 7 in two streams of cooling liquid, then converges at the second water inlet 11 and enters the spiral water trough 8, flows along the spiral water trough 8 in a stream of cooling liquid, and finally flows out from the second water outlet 12.

[0025] In the present invention, the cross-sectional sizes of the cooling water channels are substantially equal, so the flow rate and time relationship of the cooling liquid flowing through the first circulating water trough 6, the second circulating water trough 7 and the spiral water trough 8 are:

[0026] In the first circulating water tank 6, the cooling liquid is divided from the first water inlet 10 to flow in the two semicircular water tanks of the first circulating water tank 6, and the flow rate of the cooling liquid is v, and the passing time is t;

[0027] In the second circulating water trough 7, the cooling liquid flows from the first water outlet 9 to the two semicircular ring water troughs of the second circulating water trough 7, and the flow rate and passage time of the cooling liquid are the same as those of the first circulating water trough 6, and the flow rate of the cooling liquid is also v, and the passage time is also t;

[0028] In the spiral water trough 8, the cooling liquid flows into the spiral water channel after converging at the second water inlet 11, and the spiral water trough 8 is composed of a plurality of spiral water channels, and the flow rate of the cooling liquid in each spiral water channel is 2v, and the passing time is t.

[0029] The first circulating water groove 6 and the second circulating water groove 7 are both for diversion cooling, while the spiral water groove 8 is for converging cooling. Therefore, the cooling performance of the first circulating water groove 6, the second circulating water groove 7 and the spiral water groove 8 is synchronized, which solves the difference in cooling liquid flow rate in the first water groove of the mold cavity 1 and the subsequent other water grooves, and improves the axial cooling uniformity of the cooling water channel and the circumferential cooling uniformity of the first groove.

[0030] As a preferred embodiment, the first reinforcing rib 4 includes two first straight sections 13 and a curved section 14 connected between the two first straight sections 13, one end of the two first straight sections 13 is connected to the curved section 14, the curved section 14 is bent toward the second circulating water trough 7, and the first water inlet 10 is formed on the first circulating water trough 6. The other ends of the two first straight sections 13 are spaced apart to form the first water outlet 9, the arc lengths of the two first straight sections 13 are equal, and the two first straight sections 13 are perpendicular to the center line of the mold body 3. Thus, the cooling liquid enters from the first water inlet 10 and is diverted to the two semicircular water troughs of the first circulating water trough 6 for flow, and the two first straight sections 13 correspond to the two semicircular water troughs of the first circulating water trough 6.

[0031] As a preferred embodiment, the second reinforcing rib 5 is composed of a second straight section 15 and a first oblique section 16 continuously and alternately. The second straight section 15 is perpendicular to the center line of the mold body 3. Adjacent second straight sections 15 and adjacent first oblique sections 16 are distributed on the surface of the mold body 3 at the same spacing. The second straight section 15 forms a certain angle with the first oblique section 16, and connects two adjacent second straight sections 15, so that the entire second reinforcing rib 5 forms a continuous structure. The upper surface of the first second straight section 15 in the second reinforcing rib 5 is flush with the bottom end of the first water inlet 10, and the lower surface of the first second straight section 15 in the second reinforcing rib 5 is flush with the bottom end of the curved section 14, so that the overall cooling performance of the cooling water channel is more uniform and the cooling effect is improved.

[0032] As a preferred embodiment, the spacing between the first straight section 13 and the end of the mold body 3, the spacing between the first straight section 13 and the second straight section 15, and the spacing between adjacent second straight sections 15 are all equal. In order to further improve the uniformity of the overall cooling of the cooling water channel, the opening size of the first water outlet 9 is equivalent to the cross-sectional width of the first circulation water tank 6.

[0033] As a preferred embodiment, the protrusion height of the first straight section 13 from the surface of the mold body 3 is lower than the protrusion height of the curved section 14 from the surface of the mold body 3, and the curved section 14 is provided with a circumferential positioning feature 17 protruding from the first straight section 13 to form the mold cavity 1 and the mold cavity locking ring 2 when assembled. Therefore, when the mold cavity 1 and the mold cavity locking ring 2 are assembled together, the circumferential positioning feature 17 can be used to achieve rapid assembly and positioning. In addition, in order to make the mold cavity 1 and the mold cavity locking ring 2 more integrated after assembly, the protruding height of the circumferential positioning feature 17 is equivalent to the wall thickness of the mold cavity locking ring 2, and the height difference between the protruding height of the first straight section 13 from the surface of the mold body 3 and the protruding height of the curved section 14 from the surface of the mold body 3 is equal to the wall thickness of the mold cavity locking ring 2. When the mold cavity 1 and the mold cavity locking ring 2 are assembled, the mold cavity locking ring 2 is inserted from the top of the mold cavity 1 until the bottom end of the mold cavity locking ring 2 abuts against the first second straight section 15 of the second reinforcement rib 5 to complete axial positioning, and a positioning groove 18 is also provided on the mold cavity locking ring 2 for cooperating with the circumferential positioning feature 17 to complete circumferential positioning.

[0034] As a preferred embodiment, in order to reduce the flow resistance of the cooling water channel and avoid excessive concentration of impact force during the flow of the cooling liquid, rounded corners are used between the first reinforcing rib 4 and the cooling water channel, and between the second reinforcing rib 5 and the cooling water channel. The central water inlet point of the first water inlet 10 and the central water outlet point of the first water outlet 9 are rotated 180° along the central axis of the mold body 3. The central water outlet point of the first water outlet 9 and the central water inlet point of the second water inlet 11 are rotated 180° along the central axis of the mold body 3. The angle between the second straight section 15 and the first oblique section 16 is 45°, and a rounded corner transition is used between the second straight section 15 and the first oblique section 16.

[0035] In the structural design of the cooling water channel of the mold cavity 1, because the cross-sectional width of the first water groove of the spiral cooling water channel in the prior art is nearly twice or more than the cross-sectional width of other water grooves, how to improve the uniformity of axial cooling of the cooling water channel and the uniformity of circumferential cooling of the first groove is the most important technical problem. The present invention solves the above technical problems by cleverly setting the structural form of the cooling water channel and combining the circulating water channel with the spiral water channel. The first water groove and the second water groove are both circulating water grooves, and the spiral water groove 8 structure is adopted from the third water groove to the last water groove. This structural form makes the cross-sectional width of each water groove of the cooling water channel approximately equal, thereby improving the overall cooling uniformity of the cooling water channel and making the overall fluidity of the cooling liquid in the cooling water channel smooth and stable.

[0036] In this embodiment, the curved section 14 is composed of two second inclined sections 19 and a third straight section 20, and the two second inclined sections 19 are respectively arranged symmetrically about the third straight section 20. The structure of one second inclined section 19 is the same as that of the first inclined section 16, and the same setting method is adopted. The angle between the second inclined section 19 and the first straight section 13 is also 45°, so that the cross-sectional width of the water trough formed corresponding to the curved section 14 is basically equal to the cross-sectional width of other cooling water troughs, thereby maintaining the overall uniformity of the cooling water channel, and the second water inlet 11 structure formed by the other second inclined section 19 and the first second straight section 15 in the second reinforcement rib 5 makes the second water inlet 11 structure the same as the second water outlet 12 structure, thereby ensuring the consistency of the second water inlet 11 and the second water outlet 12 structure in the spiral water trough 8, making the flow rate of the cooling water channel balanced, and further improving the overall cooling uniformity of the cooling water channel.

[0037] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means belongs to the protection scope of the present invention.

Claims

1. A mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel, characterized in that: The mold body comprises a mold body, a first reinforcing rib and a second reinforcing rib, wherein a molding cavity for molding a preform is provided in the mold body, the first reinforcing rib and the second reinforcing rib are distributed at a certain interval on the outer wall of the mold body, the first reinforcing rib surrounds the outer wall of the mold body, the second reinforcing rib spirally surrounds the outer wall of the mold body, the first reinforcing rib and the end of the mold body are distributed at a certain interval to form a first circulating water groove, the first reinforcing rib and the second reinforcing rib are distributed at a certain interval to form a second circulating water groove, the second reinforcing rib spirally surrounds the outer wall of the mold body to form a spiral water groove, and the first circulating water groove, the second circulating water groove and the spiral water groove are sequentially connected to form a continuous cooling water channel; The first reinforcing rib is provided with a first water outlet for connecting the first circulating water trough with the second circulating water trough, the first reinforcing rib is provided with a first water inlet formed by bending toward one side of the second reinforcing rib, the head end of the second reinforcing rib is separated from the first reinforcing rib to form a second water inlet connecting the second circulating water trough with the spiral water trough, and the end of the second reinforcing rib is provided with a second water outlet of the spiral water trough.

2. The mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel according to claim 1, characterized in that: The first reinforcing rib comprises two first straight sections and a curved section connected between the two first straight sections, one end of the two first straight sections is connected to the curved section, the other ends of the two first straight sections are spaced apart to form a first water outlet, the arc lengths of the two first straight sections are equal, and the two first straight sections are perpendicular to the center line of the mold body.

3. The mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel according to claim 2, characterized in that: The second reinforcing rib is composed of second straight segments and first oblique segments continuously alternating with each other, the second straight segments are perpendicular to the center line of the mold body, adjacent second straight segments and adjacent first oblique segments are distributed on the surface of the mold body with the same spacing, the second straight segment forms a certain angle with the first oblique segment, and connects two adjacent second straight segments, so that the entire second reinforcing rib forms a continuous structure.

4. The mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel according to claim 3, characterized in that: The spacing between the first straight segment and the end of the mold body, the spacing between the first straight segment and the second straight segment, and the spacing between adjacent second straight segments are all equal.

5. The mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel according to claim 2, characterized in that: The protrusion height of the first straight section from the mold body surface is lower than the protrusion height of the curved section from the mold body surface, and the curved section is provided with a circumferential positioning feature protruding from the first straight section to form a mold cavity and a mold cavity locking ring when assembled.

6. The mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel according to claim 1, characterized in that: A chamfered transition is adopted between the first reinforcing rib and the cooling water channel as well as between the second reinforcing rib and the cooling water channel.

7. The mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel according to claim 1, characterized in that: The central water inlet point of the first water inlet and the central water outlet point of the first water outlet are distributed 180 degrees rotated along the central axis of the mold body.

8. The mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel according to claim 7, characterized in that: The central water outlet point of the first water outlet and the central water inlet point of the second water inlet are distributed 180 degrees rotated along the central axis of the mold body.

9. The mold cavity cooling water channel structure combining a circulating water channel and a spiral water channel according to claim 3, characterized in that: The included angle between the second straight section and the first oblique section is 45°.

Images